Nginx下载连接

我正在使用linode nodebalancer（loadbalancer）来设置我的nginx / php5-fpm服务器。 这平衡器被动检查。 这些被动检查，检查请求的状态代码。 如果5XX状态码过多，节点（vps）将由负载平衡器标记为脱机状态

节点平衡器将我的服务器以随机方式离线。 当联系linode支持他们得出结论，没有500错误，但连接丢失（或超时）。

我在我的nginx日志中找不到任何东西。 有没有什么办法可以debugging这个问题，看看哪些连接被nginx放弃了？

编辑我可以看到来自相同的IP /用户代理大量的408请求。 他们进来散装..这是可疑的？ 你将如何处理这种情况？ 来自access.log的快照

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• Nginx负载平衡器最佳规格

69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:29 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:30 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:31 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:31 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:31 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 69.30.*.* - - [22/Apr/2014:19:28:31 +0200] "POST /error/register-image-error/ HTTP/1.1" 408 0 "http://www.mysite.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 

谢谢！